66bdc70bf1
Move examples/*.sx and their expected/ snapshots into per-category subfolders (examples/<category>/...). Folder = leading filename token, with ffi-objc/ffi-jni kept whole; filenames are unchanged. The corpus runner and LSP sweep now discover each category's expected/ dir, while issues/ stays flat. Example 1058's repo-root-relative companion import is made file-relative. Path strings embedded in 164 snapshots were regenerated (path-only changes). Test-layout docs in CLAUDE.md updated.
49 lines
1.5 KiB
Plaintext
49 lines
1.5 KiB
Plaintext
// Protocol value as a field of a wrapper struct, constructed from a stack
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// local inside a function and appended to a `List`. The payload must be
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// heap-copied so dispatch survives the constructing function returning.
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#import "modules/std.sx";
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Sizable :: protocol {
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size :: (self: *Self) -> i64;
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}
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Widget :: struct { value: i64; }
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impl Sizable for Widget {
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size :: (self: *Widget) -> i64 { self.value }
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}
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// Wrapper struct with a protocol field (like ViewChild)
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Item :: struct {
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view: Sizable;
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}
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Container :: struct {
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items: List(Item);
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add :: (self: *Container, w: Widget) {
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p := w; // local copy
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self.items.append(Item.{ view = p }); // protocol created from stack local `p`
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// Works here: stack local `p` is still alive
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out("inside add: ");
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print("{}\n", self.items.items[self.items.len - 1].view.size());
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}
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}
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main :: () -> void {
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c : Container = .{};
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c.add(Widget.{ value = 42 });
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c.add(Widget.{ value = 99 });
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// BUG: items[0] should return 42, but returns 99 (reads items[1]'s stack slot)
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// Both protocol values point to the same stack address (the `p` local in add())
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r0 := c.items.items[0].view.size();
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r1 := c.items.items[1].view.size();
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print("items[0] = {} (expected 42)\n", r0);
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print("items[1] = {} (expected 99)\n", r1);
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// With more stack activity between add() and the reads, this crashes
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// (stack memory overwritten by other function calls)
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}
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